Question

Which statement correctly completes the statement?
Except for glycerine, which is achiral, all the amino acids present in proteins.:

• A. $H_3\stackrel{+}{N}\stackrel{R}{\stackrel{|}{C}}HC{O}_{2}H$are chiral, but racemic
• B. $H_{2}N\stackrel{R}{\stackrel{|}{C}}HC{O}_{2}H$have the L configuration at their $\alpha$ carbon
• C. $H_3\stackrel{+}{N}\stackrel{R}{\stackrel{|}{C}}HC{O}_2^{-}$have the R configuration at their $\alpha$ carbon
• D. $H_{2}N\stackrel{R}{\stackrel{|}{C}}HC{O}_2^{-}$have the S configuration at their $\alpha$ carbon

Answer 1

The correct option is B

$H_{2}N\stackrel{R}{\stackrel{|}{C}}HC{O}_{2}H$

have the L configuration at their $\alpha$ carbon

All amino acids naturally have L-configuration at their $\alpha$ -carbon , except glycerine which is achiral. Amino acids are building blocks of life. It is very much important for our body.